| Date | Country | Change |
| 1908 | Patriarchal Vicariate of Jerusalem (Chaldean Rite) was established | |
| 1908 | Titular Episcopal See of Massimopolis was suppressed (to Titular Episcopal See of Maximianopolis) | |
| 1908.03.09 | Apostolic Prefecture of Yukon was established (from Apostolic Vicariate of Mackenzie and became suffragan of Saint-Boniface) | |
| 1908.03.10 | Apostolic Prefecture of Stanley Falls was promoted as Apostolic Vicariate of Stanley Falls | |
| 1908.03.16 | Apostolic Prefecture of Intendencias Orientales was promoted as Apostolic Vicariate of Los Llanos de San Martín | |
| 1908.03.19 | Diocese of Santa Catarina was established (from Diocese of Curitiba and became suffragan of São Sebastião do Rio de Janeiro) | |
| 1908.03.25 | Diocese of Modigliana lost territory to Diocese of Sarsina | |
| 1908.04.05 | Diocese of Cajamarca was established (from Diocese of Chachapoyas and Diocese of Trujillo and became suffragan of Lima) | |
| 1908.04.14 | Apostolic Prefecture of Shiré was promoted as Apostolic Vicariate of Shiré | |
| 1908.04.14 | Apostolic Prefecture of Marruecos was promoted as Apostolic Vicariate of Marruecos | |
| 1908.04.28 | Apostolic Prefecture of Chocó was established (from Diocese of Antioquía) | |
| 1908.06.07 | Diocese of Botucatu was established (from Diocese of São Paulo and became suffragan of São Paulo) | |
| 1908.06.07 | Diocese of Campinas was established (from Diocese of São Paulo and became suffragan of São Paulo) | |
| 1908.06.07 | Diocese of Ribeirão Preto was established (from Diocese of São Paulo and became suffragan of São Paulo) | |
| 1908.06.07 | Diocese of São Carlos do Pinhal was established (from Diocese of São Paulo and became suffragan of São Paulo) | |
| 1908.06.07 | Diocese of São Paulo was promoted as Metropolitan Archdiocese of São Paulo (with suffragan sees Botucatu, Campinas, Ribeirão Preto, São Carlos do Pinhal and Taubaté and lost territory to establish Diocese of Botucatu, Diocese of Campinas, Diocese of Ribeirão Preto, Diocese of São Carlos do Pinhal and Diocese of Taubaté) | |
| 1908.06.07 | Diocese of Taubaté was established (from Diocese of São Paulo and became suffragan of São Paulo) | |
| 1908.09.19 | Diocese of New Westminster was promoted as Metropolitan Archdiocese of Vancouver (with suffragan sees Victoria and Mackenzie) | |
| 1908.09.19 | Metropolitan Archdiocese of Victoria was demoted as Diocese of Victoria (became suffragan of Vancouver) | |
| 1908.09.21 | Apostolic Vicariate of Temiskaming was established (from Diocese of Pembroke and became suffragan of Ottawa) | |
| 1908.09.23 | Diocese of Rockford was established (from Metropolitan Archdiocese of Chicago and became suffragan of Chicago) |
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